From 735994f82ea47118aa31278af1c9a596d35469ed Mon Sep 17 00:00:00 2001
From: Paul Gierz <pgierz@awi.de>
Date: Fri, 7 Sep 2018 11:52:21 +0200
Subject: [PATCH 1/2] Fix for #974

---
 functions/utilities.zsh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/functions/utilities.zsh b/functions/utilities.zsh
index 127007fb..cedf5493 100755
--- a/functions/utilities.zsh
+++ b/functions/utilities.zsh
@@ -102,7 +102,9 @@ case $(uname) in
       ;;
     Linux)
       OS='Linux'
-      os_release_id="$(grep -E '^ID=([a-zA-Z]*)' /etc/os-release | cut -d '=' -f 2)"
+      if [ -f /etc/os-release ]; then
+        os_release_id="$(grep -E '^ID=([a-zA-Z]*)' /etc/os-release | cut -d '=' -f 2)"
+      fi
       case "$os_release_id" in
         *arch*)
         OS_ICON=$(print_icon 'LINUX_ARCH_ICON')

From 938b0d49a13c2d69181595234e9eda4d72049396 Mon Sep 17 00:00:00 2001
From: Dominik Ritter <dritter03@googlemail.com>
Date: Wed, 23 Jan 2019 23:11:01 +0100
Subject: [PATCH 2/2] Avoid externals when parsing the os release on linux

---
 functions/utilities.zsh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/functions/utilities.zsh b/functions/utilities.zsh
index cedf5493..95f89d99 100755
--- a/functions/utilities.zsh
+++ b/functions/utilities.zsh
@@ -103,7 +103,7 @@ case $(uname) in
     Linux)
       OS='Linux'
       if [ -f /etc/os-release ]; then
-        os_release_id="$(grep -E '^ID=([a-zA-Z]*)' /etc/os-release | cut -d '=' -f 2)"
+        [[ ${(f)"$((</etc/os-release) 2>/dev/null)"} =~ "ID=([A-Za-z]+)" ]] && os_release_id="${match[1]}"
       fi
       case "$os_release_id" in
         *arch*)